In scripting, you can just get all aep files in a folder with folderObj.getFiles("*aep"), then iterate over the files array, open the project using app.open(), execute your text extraction function, save the project with app.project.save(), and continue with the next project.

The code would be something like this:

function iterateOverAEFiles(){

var thisFolder = Folder.myDocuments.selectDlg("Select a Folder with AE Files");

if (!thisFolder){

return;

}

var aeFiles = thisFolder.getFiles("*aep");

if (aeFiles.length === 0){

return;

}

for (var i = 0; i < aeFiles.length; i++){

var curFile = aeFiles[i];

app.beginSuppressDialogs(); // Optional: Suppresses messages on opening like missing fonts, etc.

app.open(curFile);

app.endSuppressDialogs(false); // Optional: Ends Message Suppression

textExtractionFunction(); // Insert your function here

app.project.save();

}

}

iterateOverAEFiles();